Doorcheck



July 1, 1930. HARRAH ET AL DOORCHECK INVENTORZY PHILIP J. HARRAH 6; JAMES H. PEARSON Filed Oct, 8, 1927 w W v. B

m N. R O Hm Patented July 1; 1930 UNITED. STATES PATENT OFFICE rHILIr J; HARRAH 4nn'umEs-n. pmnsoiv, on BLOOMFIELZD, INDIANA; sun rmson' I Assmnon ro; SAID mam j 1 nooncnnox- 1 Application medo ctober 8,1921 Serial No. 224,991

dooris opened end-when 'the'dooriis closed will increasingly'opposethe-closing of-the door and preventgslem'ming thereof.

check in said position.

The chief feature of the invention consists in the employment of the togglelever'connection between t door-lentil door frame asso-f ciated withwhich a're two. oppositely acting,

force applying constructions, whereby the increasing opposition to the closing' end opening of the door is obtained in} thegi'extreme portions of the movement thereof;

-Anothe r"-feature of theiinvention consists in the arrangement of the device suchithatff after the door has been opene'dto a' predeter p p w I, v

' t er l n 25nd n t e l nkl26 p voe y upported at '27; AT-heli'nka'geaforesaid per- 1 its elongation andlforeshoitenin'g, necessary.

n l the door movement. sin e-the j plane of movemei it ofthe-d0or check is notthe seine as mined position'iand has been openedslightl farther than that the door willybe hel'd by-th 0W v P sit vee ii i-ie -eee The fullneture' f ithefinveiition will 1b understood-from he accompanyingjfldraw In'tlie dre gsi nigziiiee ia entrances,

view of pmset afdoor and door frame 0 casing with the invention applied t erete and, in the c.ontracted}po'sition; ','F ig."2* a top? I plan viewofrthe seine,- the idottedlinesgindi- H catingaen. overcenter 'positio *endthefbroke'nf line indicating the neutra', or

for the doorj'whenopene v larged side elevzitionel view acting. check with'p'arts bro other parts in detail; Fi longitudinal section'a c H struction of the pistonmechenism "1 In thedrewings 1'10 i'1'1dicetes e'door. c'asin or frame;- 119 doer-g womlly hinges" 12 in c any desired,;'.-or*preferre struction. Thefibrecket 13 15-1110111113 the door l casing and thejbrecket;

may I be suitably I mountedv in ..;any; desired or preferred position; one "her nczyshov I a v from ltheexteri'orfof the rod to the port and being extending upward; Th f lpositi however, me; be varied inzenrr dj ofadeteiledcon "mom-nee p and when; var ed:

the particular construction of the bracket will likewise be varied to accommodate the check mechanism. Each bracket herein shown includes a U-shaped plate havingthe base 15 by which it is secured to the as {113 18 and receive a pin, the bracket 13 supporting-al'pi'n2l and bracket 14 supporting pin 22,,seid pi-n sbeing retained by the cotter key 19 or the like and by a vertical pivot pin supporting member thru the screw 16 or Jotherwise, andthe flanges 17 are apertured 20 which has another function. The double or" support; Ans-shaped link -25tandfai simileri linkj261mmpivotelly United apex and thei teppo teends.are ,piyotttll y supported 5 The linkage aftii-e'seicl,is jcluplicetedibyv anhegplane-of theifdoon ln certain types of h; re as follows 5 e'jwesher 3 9 vand annstablymountsthe'aforesaid epi rodIend-inclamped relation. ngjlongitudinallythruthe rod is the passage ii-r pen 41,- and extendingtrensversely passage l1" is the port or passage-42, the same ck or Ishock absorber construe ''imin-meey1inder32 upon 1 is'erpiston' construction 33,

hits jeeynnaer enclosed end eeiiedesatfie and mounted. l 5-j ,fA rigid washer .36 of cross a flexible} piston member 1 'upbnipins20-iandthis; formsetoggle linkage.

. n I however; onekhelf of the link- L gev eyb omitted." Conneetingthetwo el pp 2, the links 26'- der.

jacent theiropenings into the cylinder as at is and mounted therein is a screen' l l retained in position by a hollow nut 45 which has its centrally apertured portion squared or otherwise fashioned to receive a headless set screw operating tool. The minute size of the by-pass ll-a2 necessitates, for certainty of operation in continued use, provision of the aforesaid screening. Vhen the device is built in relatively large sizes such provision is not necessary but may be of assistance and even in small sizes the aforesaid screening arrangement may be omitted.

' The action is as follows: As the door closes" the piston 33, which is in the upper part of the cylinder, moves downwardly thru the fluid column 49 until the rim of piston member 38 seals against the side wall of the cylin- The force of the door then forces the liquid, which may be oil or water and preferably the former, through the ports 41 and 42 and permits the piston to settle with the door correspondingly closing until the piston reaches its lowermost position as shown dotted in- Fig. 3, whereupon the door is closed. This latter movement through the oil or liquid is very slow and the rate can be adjusted by providing an adjustable arrangement to control the size of the passage or flow of oil through ports 41 and 42, the same being not shown herein. When the door is opened the liquid trapped above the piston bears down upon the relatively free edges 38 or rim and rushes past the same into the vacuum in the lower portion of the cylinder formed as the piston 1s raised. The door in this movement also expands the toggle linkage from the position shown in Fig. 1 to the position shown in Fig. 3, which elongates spring 28 and as the door opens the resistance to the openin movement increases by tion being substantially transverse to the pivotal mounting of said connection upon the supporting anchorage, the other ends of adjacent levers being pivotally connected together, and oppositely acting means included within the bridge formation and connected to the levers adjacent the last mentioned pivotal connection.

In witness whereof, we have hereunto afiixed our signatures.

PHILIP J. HARRAH. JALIES H. PEARSGN.

the increased stretc ing of the spring28. In,

.the closing movement of the door the spring 28 assists the same until the spring becomes less and less effective, that is, in assisting the same and opposing the checking action.

The resultant construction, therefore, consists of a double acting check which in its neutral position permits relatively free movement of the door relative to the casing but which in its extreme positions opposes the quick movement of the door. The leverage increases as the spring effectiveness decreases and the leverage decreases as the springeffectiveness increases. A

The invention claimed is: 1. In combination with a casing and a closure member swingingly supported thereby, a door check construction including a multiple toggle linkage having all of the same ends of one end of the toggle construction pivotally mounted upon the casing and all of the same ends of the other end of the 

